The price of oil grabs most of the energy-related attention during conflicts in the Middle East for understandable reasons: oil is the commodity on which the world runs (still) and analysts have roughly reliable models for what every $10 per barrel increase in cost does to global growth and inflation.
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Quantifying the Swiss marriage tax
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This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.